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nanomodbus.c
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nanomodbus.c
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/*
nanoMODBUS - A compact MODBUS RTU/TCP C library for microcontrollers
MIT License
Copyright (c) 2024 Valerio De Benedetto (@debevv)
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include "nanomodbus.h"
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#ifdef NMBS_DEBUG
#include <stdio.h>
#define NMBS_DEBUG_PRINT(...) printf(__VA_ARGS__)
#else
#define NMBS_DEBUG_PRINT(...) (void) (0)
#endif
static uint8_t get_1(nmbs_t* nmbs) {
uint8_t result = nmbs->msg.buf[nmbs->msg.buf_idx];
nmbs->msg.buf_idx++;
return result;
}
static void put_1(nmbs_t* nmbs, uint8_t data) {
nmbs->msg.buf[nmbs->msg.buf_idx] = data;
nmbs->msg.buf_idx++;
}
static void discard_1(nmbs_t* nmbs) {
nmbs->msg.buf_idx++;
}
#ifndef NMBS_SERVER_DISABLED
static void discard_n(nmbs_t* nmbs, uint16_t n) {
nmbs->msg.buf_idx += n;
}
#endif
static uint16_t get_2(nmbs_t* nmbs) {
uint16_t result =
((uint16_t) nmbs->msg.buf[nmbs->msg.buf_idx]) << 8 | (uint16_t) nmbs->msg.buf[nmbs->msg.buf_idx + 1];
nmbs->msg.buf_idx += 2;
return result;
}
static void put_2(nmbs_t* nmbs, uint16_t data) {
nmbs->msg.buf[nmbs->msg.buf_idx] = (uint8_t) ((data >> 8) & 0xFFU);
nmbs->msg.buf[nmbs->msg.buf_idx + 1] = (uint8_t) data;
nmbs->msg.buf_idx += 2;
}
#ifndef NMBS_SERVER_DISABLED
static void set_1(nmbs_t* nmbs, uint8_t data, uint8_t index) {
nmbs->msg.buf[index] = data;
}
static void set_2(nmbs_t* nmbs, uint16_t data, uint8_t index) {
nmbs->msg.buf[index] = (uint8_t) ((data >> 8) & 0xFFU);
nmbs->msg.buf[index + 1] = (uint8_t) data;
}
#endif
static uint8_t* get_n(nmbs_t* nmbs, uint16_t n) {
uint8_t* msg_buf_ptr = nmbs->msg.buf + nmbs->msg.buf_idx;
nmbs->msg.buf_idx += n;
return msg_buf_ptr;
}
#ifndef NMBS_SERVER_DISABLED
static void put_n(nmbs_t* nmbs, const uint8_t* data, uint8_t size) {
memcpy(&nmbs->msg.buf[nmbs->msg.buf_idx], data, size);
nmbs->msg.buf_idx += size;
}
static uint16_t* get_regs(nmbs_t* nmbs, uint16_t n) {
uint16_t* msg_buf_ptr = (uint16_t*) (nmbs->msg.buf + nmbs->msg.buf_idx);
nmbs->msg.buf_idx += n * 2;
while (n--) {
msg_buf_ptr[n] = (msg_buf_ptr[n] << 8) | ((msg_buf_ptr[n] >> 8) & 0xFF);
}
return msg_buf_ptr;
}
#endif
#ifndef NMBS_CLIENT_DISABLED
static void put_regs(nmbs_t* nmbs, const uint16_t* data, uint16_t n) {
uint16_t* msg_buf_ptr = (uint16_t*) (nmbs->msg.buf + nmbs->msg.buf_idx);
nmbs->msg.buf_idx += n * 2;
while (n--) {
msg_buf_ptr[n] = (data[n] << 8) | ((data[n] >> 8) & 0xFF);
}
}
#endif
static void swap_regs(uint16_t* data, uint16_t n) {
while (n--) {
data[n] = (data[n] << 8) | ((data[n] >> 8) & 0xFF);
}
}
static void msg_buf_reset(nmbs_t* nmbs) {
nmbs->msg.buf_idx = 0;
}
static void msg_state_reset(nmbs_t* nmbs) {
msg_buf_reset(nmbs);
nmbs->msg.unit_id = 0;
nmbs->msg.fc = 0;
nmbs->msg.transaction_id = 0;
nmbs->msg.broadcast = false;
nmbs->msg.ignored = false;
}
#ifndef NMBS_CLIENT_DISABLED
static void msg_state_req(nmbs_t* nmbs, uint8_t fc) {
if (nmbs->current_tid == UINT16_MAX)
nmbs->current_tid = 1;
else
nmbs->current_tid++;
// Flush the remaining data on the line before sending the request
nmbs->platform.read(nmbs->msg.buf, sizeof(nmbs->msg.buf), 0, nmbs->platform.arg);
msg_state_reset(nmbs);
nmbs->msg.unit_id = nmbs->dest_address_rtu;
nmbs->msg.fc = fc;
nmbs->msg.transaction_id = nmbs->current_tid;
if (nmbs->msg.unit_id == 0 && nmbs->platform.transport == NMBS_TRANSPORT_RTU)
nmbs->msg.broadcast = true;
}
#endif
nmbs_error nmbs_create(nmbs_t* nmbs, const nmbs_platform_conf* platform_conf) {
if (!nmbs)
return NMBS_ERROR_INVALID_ARGUMENT;
memset(nmbs, 0, sizeof(nmbs_t));
nmbs->byte_timeout_ms = -1;
nmbs->read_timeout_ms = -1;
if (!platform_conf)
return NMBS_ERROR_INVALID_ARGUMENT;
if (platform_conf->transport != NMBS_TRANSPORT_RTU && platform_conf->transport != NMBS_TRANSPORT_TCP)
return NMBS_ERROR_INVALID_ARGUMENT;
if (!platform_conf->read || !platform_conf->write)
return NMBS_ERROR_INVALID_ARGUMENT;
nmbs->platform = *platform_conf;
return NMBS_ERROR_NONE;
}
void nmbs_set_read_timeout(nmbs_t* nmbs, int32_t timeout_ms) {
nmbs->read_timeout_ms = timeout_ms;
}
void nmbs_set_byte_timeout(nmbs_t* nmbs, int32_t timeout_ms) {
nmbs->byte_timeout_ms = timeout_ms;
}
void nmbs_set_destination_rtu_address(nmbs_t* nmbs, uint8_t address) {
nmbs->dest_address_rtu = address;
}
void nmbs_set_platform_arg(nmbs_t* nmbs, void* arg) {
nmbs->platform.arg = arg;
}
uint16_t nmbs_crc_calc(const uint8_t* data, uint32_t length) {
uint16_t crc = 0xFFFF;
for (uint32_t i = 0; i < length; i++) {
crc ^= (uint16_t) data[i];
for (int j = 8; j != 0; j--) {
if ((crc & 0x0001) != 0) {
crc >>= 1;
crc ^= 0xA001;
}
else
crc >>= 1;
}
}
return (uint16_t) (crc << 8) | (uint16_t) (crc >> 8);
}
static nmbs_error recv(nmbs_t* nmbs, uint16_t count) {
int32_t ret =
nmbs->platform.read(nmbs->msg.buf + nmbs->msg.buf_idx, count, nmbs->byte_timeout_ms, nmbs->platform.arg);
if (ret == count)
return NMBS_ERROR_NONE;
if (ret < count) {
if (ret < 0)
return NMBS_ERROR_TRANSPORT;
return NMBS_ERROR_TIMEOUT;
}
return NMBS_ERROR_TRANSPORT;
}
static nmbs_error send(nmbs_t* nmbs, uint16_t count) {
int32_t ret = nmbs->platform.write(nmbs->msg.buf, count, nmbs->byte_timeout_ms, nmbs->platform.arg);
if (ret == count)
return NMBS_ERROR_NONE;
if (ret < count) {
if (ret < 0)
return NMBS_ERROR_TRANSPORT;
return NMBS_ERROR_TIMEOUT;
}
return NMBS_ERROR_TRANSPORT;
}
static nmbs_error recv_msg_footer(nmbs_t* nmbs) {
NMBS_DEBUG_PRINT("\n");
if (nmbs->platform.transport == NMBS_TRANSPORT_RTU) {
uint16_t crc = nmbs_crc_calc(nmbs->msg.buf, nmbs->msg.buf_idx);
nmbs_error err = recv(nmbs, 2);
if (err != NMBS_ERROR_NONE)
return err;
uint16_t recv_crc = get_2(nmbs);
if (recv_crc != crc)
return NMBS_ERROR_CRC;
}
return NMBS_ERROR_NONE;
}
static nmbs_error recv_msg_header(nmbs_t* nmbs, bool* first_byte_received) {
// We wait for the read timeout here, just for the first message byte
int32_t old_byte_timeout = nmbs->byte_timeout_ms;
nmbs->byte_timeout_ms = nmbs->read_timeout_ms;
msg_state_reset(nmbs);
*first_byte_received = false;
if (nmbs->platform.transport == NMBS_TRANSPORT_RTU) {
nmbs_error err = recv(nmbs, 1);
nmbs->byte_timeout_ms = old_byte_timeout;
if (err != NMBS_ERROR_NONE)
return err;
*first_byte_received = true;
nmbs->msg.unit_id = get_1(nmbs);
err = recv(nmbs, 1);
if (err != NMBS_ERROR_NONE)
return err;
nmbs->msg.fc = get_1(nmbs);
}
else if (nmbs->platform.transport == NMBS_TRANSPORT_TCP) {
nmbs_error err = recv(nmbs, 1);
nmbs->byte_timeout_ms = old_byte_timeout;
if (err != NMBS_ERROR_NONE)
return err;
*first_byte_received = true;
// Advance buf_idx
discard_1(nmbs);
err = recv(nmbs, 7);
if (err != NMBS_ERROR_NONE)
return err;
// Starting over
msg_buf_reset(nmbs);
nmbs->msg.transaction_id = get_2(nmbs);
uint16_t protocol_id = get_2(nmbs);
uint16_t length = get_2(nmbs); // We should actually check the length of the request against this value
nmbs->msg.unit_id = get_1(nmbs);
nmbs->msg.fc = get_1(nmbs);
if (protocol_id != 0)
return NMBS_ERROR_INVALID_TCP_MBAP;
if (length > 255)
return NMBS_ERROR_INVALID_TCP_MBAP;
}
return NMBS_ERROR_NONE;
}
static void put_msg_header(nmbs_t* nmbs, uint16_t data_length) {
msg_buf_reset(nmbs);
if (nmbs->platform.transport == NMBS_TRANSPORT_RTU) {
put_1(nmbs, nmbs->msg.unit_id);
}
else if (nmbs->platform.transport == NMBS_TRANSPORT_TCP) {
put_2(nmbs, nmbs->msg.transaction_id);
put_2(nmbs, 0);
put_2(nmbs, (uint16_t) (1 + 1 + data_length));
put_1(nmbs, nmbs->msg.unit_id);
}
put_1(nmbs, nmbs->msg.fc);
}
#ifndef NMBS_SERVER_DISABLED
static void set_msg_header_size(nmbs_t* nmbs, uint16_t data_length) {
if (nmbs->platform.transport == NMBS_TRANSPORT_TCP) {
data_length += 2;
set_2(nmbs, data_length, 4);
}
}
#endif
static nmbs_error send_msg(nmbs_t* nmbs) {
NMBS_DEBUG_PRINT("\n");
if (nmbs->platform.transport == NMBS_TRANSPORT_RTU) {
uint16_t crc = nmbs_crc_calc(nmbs->msg.buf, nmbs->msg.buf_idx);
put_2(nmbs, crc);
}
nmbs_error err = send(nmbs, nmbs->msg.buf_idx);
return err;
}
#ifndef NMBS_SERVER_DISABLED
static nmbs_error recv_req_header(nmbs_t* nmbs, bool* first_byte_received) {
nmbs_error err = recv_msg_header(nmbs, first_byte_received);
if (err != NMBS_ERROR_NONE)
return err;
if (nmbs->platform.transport == NMBS_TRANSPORT_RTU) {
// Check if request is for us
if (nmbs->msg.unit_id == NMBS_BROADCAST_ADDRESS)
nmbs->msg.broadcast = true;
else if (nmbs->msg.unit_id != nmbs->address_rtu)
nmbs->msg.ignored = true;
else
nmbs->msg.ignored = false;
}
return NMBS_ERROR_NONE;
}
static void put_res_header(nmbs_t* nmbs, uint16_t data_length) {
put_msg_header(nmbs, data_length);
NMBS_DEBUG_PRINT("%d NMBS res -> address_rtu %d\tfc %d\t", nmbs->address_rtu, nmbs->address_rtu, nmbs->msg.fc);
}
static nmbs_error send_exception_msg(nmbs_t* nmbs, uint8_t exception) {
nmbs->msg.fc += 0x80;
put_msg_header(nmbs, 1);
put_1(nmbs, exception);
NMBS_DEBUG_PRINT("%d NMBS res -> address_rtu %d\texception %d", nmbs->address_rtu, nmbs->address_rtu, exception);
return send_msg(nmbs);
}
#endif
static nmbs_error recv_res_header(nmbs_t* nmbs) {
uint16_t req_transaction_id = nmbs->msg.transaction_id;
uint8_t req_unit_id = nmbs->msg.unit_id;
uint8_t req_fc = nmbs->msg.fc;
bool first_byte_received = false;
nmbs_error err = recv_msg_header(nmbs, &first_byte_received);
if (err != NMBS_ERROR_NONE)
return err;
if (nmbs->platform.transport == NMBS_TRANSPORT_TCP) {
if (nmbs->msg.transaction_id != req_transaction_id)
return NMBS_ERROR_INVALID_TCP_MBAP;
}
if (nmbs->platform.transport == NMBS_TRANSPORT_RTU && nmbs->msg.unit_id != req_unit_id)
return NMBS_ERROR_INVALID_UNIT_ID;
if (nmbs->msg.fc != req_fc) {
if (nmbs->msg.fc - 0x80 == req_fc) {
err = recv(nmbs, 1);
if (err != NMBS_ERROR_NONE)
return err;
uint8_t exception = get_1(nmbs);
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
if (exception < 1 || exception > 4)
return NMBS_ERROR_INVALID_RESPONSE;
NMBS_DEBUG_PRINT("%d NMBS res <- address_rtu %d\texception %d\n", nmbs->address_rtu, nmbs->msg.unit_id,
exception);
return (nmbs_error) exception;
}
return NMBS_ERROR_INVALID_RESPONSE;
}
NMBS_DEBUG_PRINT("%d NMBS res <- address_rtu %d\tfc %d\t", nmbs->address_rtu, nmbs->msg.unit_id, nmbs->msg.fc);
return NMBS_ERROR_NONE;
}
#ifndef NMBS_CLIENT_DISABLED
static void put_req_header(nmbs_t* nmbs, uint16_t data_length) {
put_msg_header(nmbs, data_length);
#ifdef NMBS_DEBUG
printf("%d ", nmbs->address_rtu);
printf("NMBS req -> ");
if (nmbs->platform.transport == NMBS_TRANSPORT_RTU) {
if (nmbs->msg.broadcast)
printf("broadcast\t");
else
printf("address_rtu %d\t", nmbs->dest_address_rtu);
}
printf("fc %d\t", nmbs->msg.fc);
#endif
}
#endif
static nmbs_error recv_read_discrete_res(nmbs_t* nmbs, nmbs_bitfield values) {
nmbs_error err = recv_res_header(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
err = recv(nmbs, 1);
if (err != NMBS_ERROR_NONE)
return err;
uint8_t coils_bytes = get_1(nmbs);
NMBS_DEBUG_PRINT("b %d\t", coils_bytes);
if (coils_bytes > 250) {
return NMBS_ERROR_INVALID_RESPONSE;
}
err = recv(nmbs, coils_bytes);
if (err != NMBS_ERROR_NONE)
return err;
NMBS_DEBUG_PRINT("coils ");
for (int i = 0; i < coils_bytes; i++) {
uint8_t coil = get_1(nmbs);
if (values)
values[i] = coil;
NMBS_DEBUG_PRINT("%d ", coil);
}
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
return NMBS_ERROR_NONE;
}
static nmbs_error recv_read_registers_res(nmbs_t* nmbs, uint16_t quantity, uint16_t* registers) {
nmbs_error err = recv_res_header(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
err = recv(nmbs, 1);
if (err != NMBS_ERROR_NONE)
return err;
uint8_t registers_bytes = get_1(nmbs);
NMBS_DEBUG_PRINT("b %d\t", registers_bytes);
if (registers_bytes > 250)
return NMBS_ERROR_INVALID_RESPONSE;
err = recv(nmbs, registers_bytes);
if (err != NMBS_ERROR_NONE)
return err;
NMBS_DEBUG_PRINT("regs ");
for (int i = 0; i < registers_bytes / 2; i++) {
uint16_t reg = get_2(nmbs);
if (registers)
registers[i] = reg;
NMBS_DEBUG_PRINT("%d ", reg);
}
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
if (registers_bytes != quantity * 2)
return NMBS_ERROR_INVALID_RESPONSE;
return NMBS_ERROR_NONE;
}
nmbs_error recv_write_single_coil_res(nmbs_t* nmbs, uint16_t address, uint16_t value_req) {
nmbs_error err = recv_res_header(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
err = recv(nmbs, 4);
if (err != NMBS_ERROR_NONE)
return err;
uint16_t address_res = get_2(nmbs);
uint16_t value_res = get_2(nmbs);
NMBS_DEBUG_PRINT("a %d\tvalue %d", address, value_res);
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
if (address_res != address)
return NMBS_ERROR_INVALID_RESPONSE;
if (value_res != value_req)
return NMBS_ERROR_INVALID_RESPONSE;
return NMBS_ERROR_NONE;
}
nmbs_error recv_write_single_register_res(nmbs_t* nmbs, uint16_t address, uint16_t value_req) {
nmbs_error err = recv_res_header(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
err = recv(nmbs, 4);
if (err != NMBS_ERROR_NONE)
return err;
uint16_t address_res = get_2(nmbs);
uint16_t value_res = get_2(nmbs);
NMBS_DEBUG_PRINT("a %d\tvalue %d ", address, value_res);
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
if (address_res != address)
return NMBS_ERROR_INVALID_RESPONSE;
if (value_res != value_req)
return NMBS_ERROR_INVALID_RESPONSE;
return NMBS_ERROR_NONE;
}
nmbs_error recv_write_multiple_coils_res(nmbs_t* nmbs, uint16_t address, uint16_t quantity) {
nmbs_error err = recv_res_header(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
err = recv(nmbs, 4);
if (err != NMBS_ERROR_NONE)
return err;
uint16_t address_res = get_2(nmbs);
uint16_t quantity_res = get_2(nmbs);
NMBS_DEBUG_PRINT("a %d\tq %d", address_res, quantity_res);
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
if (address_res != address)
return NMBS_ERROR_INVALID_RESPONSE;
if (quantity_res != quantity)
return NMBS_ERROR_INVALID_RESPONSE;
return NMBS_ERROR_NONE;
}
nmbs_error recv_write_multiple_registers_res(nmbs_t* nmbs, uint16_t address, uint16_t quantity) {
nmbs_error err = recv_res_header(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
err = recv(nmbs, 4);
if (err != NMBS_ERROR_NONE)
return err;
uint16_t address_res = get_2(nmbs);
uint16_t quantity_res = get_2(nmbs);
NMBS_DEBUG_PRINT("a %d\tq %d", address_res, quantity_res);
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
if (address_res != address)
return NMBS_ERROR_INVALID_RESPONSE;
if (quantity_res != quantity)
return NMBS_ERROR_INVALID_RESPONSE;
return NMBS_ERROR_NONE;
}
nmbs_error recv_read_file_record_res(nmbs_t* nmbs, uint16_t* registers, uint16_t count) {
nmbs_error err = recv_res_header(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
err = recv(nmbs, 1);
if (err != NMBS_ERROR_NONE)
return err;
uint8_t response_size = get_1(nmbs);
if (response_size > 250) {
return NMBS_ERROR_INVALID_RESPONSE;
}
err = recv(nmbs, response_size);
if (err != NMBS_ERROR_NONE)
return err;
uint8_t subreq_data_size = get_1(nmbs) - 1;
uint8_t subreq_reference_type = get_1(nmbs);
uint16_t* subreq_record_data = (uint16_t*) get_n(nmbs, subreq_data_size);
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
if (registers) {
if (subreq_reference_type != 6)
return NMBS_ERROR_INVALID_RESPONSE;
if (count != (subreq_data_size / 2))
return NMBS_ERROR_INVALID_RESPONSE;
swap_regs(subreq_record_data, subreq_data_size / 2);
memcpy(registers, subreq_record_data, subreq_data_size);
}
return NMBS_ERROR_NONE;
}
nmbs_error recv_write_file_record_res(nmbs_t* nmbs, uint16_t file_number, uint16_t record_number,
const uint16_t* registers, uint16_t count) {
nmbs_error err = recv_res_header(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
err = recv(nmbs, 1);
if (err != NMBS_ERROR_NONE)
return err;
uint8_t response_size = get_1(nmbs);
if (response_size > 251)
return NMBS_ERROR_INVALID_RESPONSE;
err = recv(nmbs, response_size);
if (err != NMBS_ERROR_NONE)
return err;
uint8_t subreq_reference_type = get_1(nmbs);
uint16_t subreq_file_number = get_2(nmbs);
uint16_t subreq_record_number = get_2(nmbs);
uint16_t subreq_record_length = get_2(nmbs);
NMBS_DEBUG_PRINT("a %d\tr %d\tl %d\t fwrite ", subreq_file_number, subreq_record_number, subreq_record_length);
uint16_t subreq_data_size = subreq_record_length * 2;
uint16_t* subreq_record_data = (uint16_t*) get_n(nmbs, subreq_data_size);
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
if (registers) {
if (subreq_reference_type != 6)
return NMBS_ERROR_INVALID_RESPONSE;
if (subreq_file_number != file_number)
return NMBS_ERROR_INVALID_RESPONSE;
if (subreq_record_number != record_number)
return NMBS_ERROR_INVALID_RESPONSE;
if (subreq_record_length != count)
return NMBS_ERROR_INVALID_RESPONSE;
swap_regs(subreq_record_data, subreq_record_length);
if (memcmp(registers, subreq_record_data, subreq_data_size) != 0)
return NMBS_ERROR_INVALID_RESPONSE;
}
return NMBS_ERROR_NONE;
}
nmbs_error recv_read_device_identification_res(nmbs_t* nmbs, uint8_t buffers_count, char** buffers_out,
uint8_t buffers_length, const uint8_t* order, uint8_t* ids_out,
uint8_t* next_object_id_out, uint8_t* objects_count_out) {
nmbs_error err = recv_res_header(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
err = recv(nmbs, 6);
if (err != NMBS_ERROR_NONE)
return err;
uint8_t mei_type = get_1(nmbs);
if (mei_type != 0x0E)
return NMBS_ERROR_INVALID_RESPONSE;
uint8_t read_device_id_code = get_1(nmbs);
if (read_device_id_code < 1 || read_device_id_code > 4)
return NMBS_ERROR_INVALID_RESPONSE;
uint8_t conformity_level = get_1(nmbs);
if (conformity_level < 1 || (conformity_level > 3 && conformity_level < 0x81) || conformity_level > 0x83)
return NMBS_ERROR_INVALID_RESPONSE;
uint8_t more_follows = get_1(nmbs);
if (more_follows != 0 && more_follows != 0xFF)
return NMBS_ERROR_INVALID_RESPONSE;
uint8_t next_object_id = get_1(nmbs);
uint8_t objects_count = get_1(nmbs);
if (objects_count_out)
*objects_count_out = objects_count;
if (buffers_count == 0) {
buffers_out = NULL;
}
else if (objects_count > buffers_count)
return NMBS_ERROR_INVALID_ARGUMENT;
if (more_follows == 0)
next_object_id = 0x7F; // This value is reserved in the spec, we use it to signal stream is finished
if (next_object_id_out)
*next_object_id_out = next_object_id;
uint8_t res_size_left = 253 - 7;
for (int i = 0; i < objects_count; i++) {
err = recv(nmbs, 2);
if (err != NMBS_ERROR_NONE)
return err;
uint8_t object_id = get_1(nmbs);
uint8_t object_length = get_1(nmbs);
res_size_left -= 2;
if (object_length > res_size_left)
return NMBS_ERROR_INVALID_RESPONSE;
err = recv(nmbs, object_length);
if (err != NMBS_ERROR_NONE)
return err;
const char* str = (const char*) get_n(nmbs, object_length);
if (ids_out)
ids_out[i] = object_id;
uint8_t buf_index = i;
if (order)
buf_index = order[object_id];
if (buffers_out) {
strncpy(buffers_out[buf_index], str, buffers_length);
buffers_out[buf_index][object_length] = 0;
}
}
return recv_msg_footer(nmbs);
}
#ifndef NMBS_SERVER_DISABLED
#if !defined(NMBS_SERVER_READ_COILS_DISABLED) || !defined(NMBS_SERVER_READ_DISCRETE_INPUTS_DISABLED)
static nmbs_error handle_read_discrete(nmbs_t* nmbs,
nmbs_error (*callback)(uint16_t, uint16_t, nmbs_bitfield, uint8_t, void*)) {
nmbs_error err = recv(nmbs, 4);
if (err != NMBS_ERROR_NONE)
return err;
uint16_t address = get_2(nmbs);
uint16_t quantity = get_2(nmbs);
NMBS_DEBUG_PRINT("a %d\tq %d", address, quantity);
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
if (!nmbs->msg.ignored) {
if (quantity < 1 || quantity > 2000)
return send_exception_msg(nmbs, NMBS_EXCEPTION_ILLEGAL_DATA_VALUE);
if ((uint32_t) address + (uint32_t) quantity > ((uint32_t) 0xFFFF) + 1)
return send_exception_msg(nmbs, NMBS_EXCEPTION_ILLEGAL_DATA_ADDRESS);
if (callback) {
nmbs_bitfield bitfield = {0};
err = callback(address, quantity, bitfield, nmbs->msg.unit_id, nmbs->callbacks.arg);
if (err != NMBS_ERROR_NONE) {
if (nmbs_error_is_exception(err))
return send_exception_msg(nmbs, err);
return send_exception_msg(nmbs, NMBS_EXCEPTION_SERVER_DEVICE_FAILURE);
}
if (!nmbs->msg.broadcast) {
uint8_t discrete_bytes = (quantity + 7) / 8;
put_res_header(nmbs, 1 + discrete_bytes);
put_1(nmbs, discrete_bytes);
NMBS_DEBUG_PRINT("b %d\t", discrete_bytes);
NMBS_DEBUG_PRINT("coils ");
for (int i = 0; i < discrete_bytes; i++) {
put_1(nmbs, bitfield[i]);
NMBS_DEBUG_PRINT("%d ", bitfield[i]);
}
err = send_msg(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
}
}
else {
return send_exception_msg(nmbs, NMBS_EXCEPTION_ILLEGAL_FUNCTION);
}
}
else {
return recv_read_discrete_res(nmbs, NULL);
}
return NMBS_ERROR_NONE;
}
#endif
#if !defined(NMBS_SERVER_READ_HOLDING_REGISTERS_DISABLED) || !defined(NMBS_SERVER_READ_INPUT_REGISTERS_DISABLED)
static nmbs_error handle_read_registers(nmbs_t* nmbs,
nmbs_error (*callback)(uint16_t, uint16_t, uint16_t*, uint8_t, void*)) {
nmbs_error err = recv(nmbs, 4);
if (err != NMBS_ERROR_NONE)
return err;
uint16_t address = get_2(nmbs);
uint16_t quantity = get_2(nmbs);
NMBS_DEBUG_PRINT("a %d\tq %d", address, quantity);
err = recv_msg_footer(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
if (!nmbs->msg.ignored) {
if (quantity < 1 || quantity > 125)
return send_exception_msg(nmbs, NMBS_EXCEPTION_ILLEGAL_DATA_VALUE);
if ((uint32_t) address + (uint32_t) quantity > ((uint32_t) 0xFFFF) + 1)
return send_exception_msg(nmbs, NMBS_EXCEPTION_ILLEGAL_DATA_ADDRESS);
if (callback) {
uint16_t regs[125] = {0};
err = callback(address, quantity, regs, nmbs->msg.unit_id, nmbs->callbacks.arg);
if (err != NMBS_ERROR_NONE) {
if (nmbs_error_is_exception(err))
return send_exception_msg(nmbs, err);
return send_exception_msg(nmbs, NMBS_EXCEPTION_SERVER_DEVICE_FAILURE);
}
// TODO check all these read request broadcast use cases
if (!nmbs->msg.broadcast) {
uint8_t regs_bytes = quantity * 2;
put_res_header(nmbs, 1 + regs_bytes);
put_1(nmbs, regs_bytes);
NMBS_DEBUG_PRINT("b %d\t", regs_bytes);
NMBS_DEBUG_PRINT("regs ");
for (int i = 0; i < quantity; i++) {
put_2(nmbs, regs[i]);
NMBS_DEBUG_PRINT("%d ", regs[i]);
}
err = send_msg(nmbs);
if (err != NMBS_ERROR_NONE)
return err;
}
}
else {
return send_exception_msg(nmbs, NMBS_EXCEPTION_ILLEGAL_FUNCTION);
}
}
else {
return recv_read_registers_res(nmbs, quantity, NULL);
}
return NMBS_ERROR_NONE;
}
#endif
#ifndef NMBS_SERVER_READ_COILS_DISABLED
static nmbs_error handle_read_coils(nmbs_t* nmbs) {
return handle_read_discrete(nmbs, nmbs->callbacks.read_coils);
}
#endif
#ifndef NMBS_SERVER_READ_DISCRETE_INPUTS_DISABLED
static nmbs_error handle_read_discrete_inputs(nmbs_t* nmbs) {
return handle_read_discrete(nmbs, nmbs->callbacks.read_discrete_inputs);
}
#endif
#ifndef NMBS_SERVER_READ_HOLDING_REGISTERS_DISABLED
static nmbs_error handle_read_holding_registers(nmbs_t* nmbs) {